SC9148B(2002) Ver la hoja de datos (PDF) - Silan Microelectronics

Número de pieza

componentes Descripción

Fabricante

SC9148B
(Rev.:2002)

FOR INFRARED REMOTE CONTROL TRANSMITTER

Silan Microelectronics 

Silan

Semiconductors

6.3 SINGLE-SHOT SIGNAL

SC9148B

Single-shot

KEY ON

60a

48a

80a

48a

Tx OUT

When any one of the single-shot keys is depressed , the above single-shot signal is transmitted in 2 cycles, and

the transmitting output ends.

6.4 CONTINUOUS SIGNAL

Continuous

KEY ON

60a 48a

80a

48a

Tx OUT

208a

48a

80a

48a

When any one of the continuous keys is depressed, the above continuous signal is 2 cycles output, repeatedly

output 208a pause and 2 cycles is 2 pause of 208a.

6.5 CARRIER WAVE

About 50~100mA current is normally applied through an infrared LED in order to extend an infrared ray reaching

distance. Therefore, if a time, when LED is ON, is shortened as could as possible , it leads to reduction in power

consumption. On this IC, when single-shot or continuous signal is transmitting, each bit is switching by a carrier of

duty 1/3, output after the pulse modulated.

Carrier(fc) is decided by oscillation frequency fosc by means of XT and non-XT,

fc=fosc/12(Hz), fc=38kHz at fosc=455kHz.

"1"

"0"

Transmitting

Signal

Pulse Modulated

Transmitting Signal

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Rev: 2.1 2002.09.10.

6

Share Link: